Why should interest-bearing investments be part of my investment portfolio?

Key takeaways

  • Interest-bearing funds invest in securities that earn interest such as bonds and deposits.
  • Three types of interest-bearing funds - bonds, income funds and money market funds - differ in the average term to maturity of the securities they hold.
  • Bond funds can have the longest terms to maturity while money market funds have the shortest, making the capital relatively secure.
  • Interest-bearing investments can:
    • Provide a steady, predictable source of income.
    • Diversify away from the risk that comes with investing only in shares.
    • Help preserve your capital when, for example, you are near retirement.
    • Boost your returns when instruments like bonds earn good returns.

 

Fixed-income investments, such as corporate and government bonds and money market investments, have a place among your investments, whether you are just starting out or about to retire.

The reasons why you should consider including them, in line with your investment goals, are:

  • Interest-bearing funds can provide a steady, predictable source of income which can boost the returns of your portfolio even when the price of shares and bonds are not rising.
  • Interest-bearing funds are typically lower risk than equities and listed property (these two asset classes are often referred to as growth assets) and this means that including them can give you greater diversity and reduce the overall risk of your investments.
  • They can help you preserve the value of your capital when you are close to needing to draw out your investment – for example, when you are close to retirement.
  • Some interest-bearing instruments can boost your returns as there are opportunities to make money buying and selling some interest-bearing investments such as bonds.

 

Investing in bonds

Bonds are a key investment in the interest-bearing sector. These are essentially loans to governments, utility providers such as Eskom, or private companies. The loans are divided up into bonds and sold on auction to investors.

Bonds pay interest over the term of the loan – monthly, quarterly or twice a year - and pay back your investment at the end of the term, or at the end of the term they pay you back more than you initially invested.

You can invest indirectly in bonds as you can in shares, but typically the investment amounts are too high for ordinary investors – a million rand or multiples thereof.

Unit trust fund managers using investors’ pooled money, are, however, able to invest in bonds. As investment professionals, they also know how to buy and sell bonds on the bond market.

Bonds are sold in what is known as the primary bond market at auctions. They are typically bought by primary brokers at the likes of banks that sell them on to investors – individuals or asset managers.

You can buy and hold a bond to maturity, but typically investors buy and sell bonds before they reach maturity in the secondary market.

On the secondary market, bonds may cost more or less than the amount for which they were originally sold.

The price of the bond depends on what investors are prepared to pay for the bonds. This in turn depends on investors’ views on:

  • The interest income they will earn from the bond relative to current and future interest rates. If current interest rates go up higher than the interest rate a bond is paying, its price will fall as it will be less valuable, but if rates go down, a bond with a higher rate is likely to be more valuable.
  • How good the issuer is to meet its promise to repay the capital. If a government or company has cashflow problems, the risk of it defaulting on bonds it has issued increases, and the price of the bond will typically fall.

Professional investors, such as unit trust fund managers, take a view on where rates are going and on the risk of default. They decide what is a good price at which to buy or sell bonds. In this way they can make a capital gain or loss on a bond.

 

Other interest-earning instruments

Fixed interest fund managers also invest in a variety of interest-bearing instruments that are issued by governments, banks or parastatals that pay interest. These include:

  • Treasury bills 
  • Call deposits
  • Notice deposits
  • Banker’s acceptances
  • Promissory notes
  • Negotiable certificates of deposit

Investors in all of these instruments must assess the risk of the issuer defaulting – the credit risk and the risk of earning less than future interest rates.

However, on money lent over a short term, the risks are generally lower as investors have more certainty about interest rates and the risk of the issuer defaulting than they do over longer periods.

Some bonds have very long terms to maturity – for example, 30 years. This can make it difficult to call how valuable the bond may be in the future and makes bond investments more risky.

Unit trust funds in the fixed income sub-categories have therefore been classified according to the terms to maturity of the instruments in which they invest.

 

Money market funds

The least risky funds are the money market funds and they can only invest in fixed interest instruments with a term to maturity of less than 13 months.

The average term to maturity - or what fund managers call the duration of the fund's holdings - may not exceed 90 days and the weighted average duration to maturity of all the holdings may not exceed 120 days.

When you invest in a money market fund for every rand you invest you can expect that in most cases you will receive the same rand amount back when you want to withdraw – your capital is reasonably secure.

The only time you may lose money on a money market fund is when a bank fails and cannot honour, or honour in full, the instruments issued to investors.

You will also receive interest the fund is paying. The interest can be paid to you when it is distributed or you can reinvest it to increase the amount you invested.

The interest paid by money market funds is typically higher than the interest you will receive on a bank deposit that is not fixed or tied up for a certain period.

The interest rate will change if the central bank – the South African Reserve Bank in South Africa – takes the interest rates up or down.

 

Short-term interest-bearing funds

Investors who are prepared to take a little more investment risk can invest in other interest-bearing funds and potentially earn a higher interest rate.

These funds are classified as short-term interest-bearing and can invest in interest-bearing instruments with any term to maturity as long as on average the terms to maturity (duration) do not exceed two years.

Bond funds are the third kind of fixed interest funds and these can invest in fixed interest instruments of any duration. They fall under the fixed interest variable term sub-category, because fund managers typically vary the duration of the fund depending on the interest rate cycle and the bonds they think will offer the best returns.